Grommet



FIG. 1 is a perspective view from above of the grommet in accordance with the new design;

FIG. 2 is a top plan view of the grommet of FIG. 1; and,

FIG. 3 is a front elevation view of the grommet of FIG. 1, the back, sides and bottom forming no part of the claimed design.

The broken lines are included for the purpose of illustrating environment and form no part of the claimed design. 

The ornamental design for a grommet, as shown and described. 